diff --git a/esp32_MachineNotify.ino b/esp32_MachineNotify.ino
index 1f3c182..cba7ea6 100644
--- a/esp32_MachineNotify.ino
+++ b/esp32_MachineNotify.ino
@@ -339,13 +339,28 @@ void updateDisplay() {
   display.clearDisplay();
   display.setTextSize(1);
   display.setTextColor(WHITE);
-  display.setCursor(0, 0);
+
+  // Draw active status indicator
+  int rectWidth = 10;
+  int rectHeight = SCREEN_HEIGHT;
+  int rectX = 2;
+  int rectY = (SCREEN_HEIGHT - rectHeight) / 2;
+  int textX = rectX + rectWidth + 4;
 
   for (int i = 0; i < displayDataLines; i++) {
     int lineIndex = (currentDisplayLine + i) % displayDataLines;
+    display.setCursor(textX, i * 8);
     display.println(displayData[lineIndex]);
   }
 
+  display.drawRect(rectX, rectY, rectWidth, rectHeight, WHITE);
+
+  if (isDeviceActive) {
+    int innerWidth = rectWidth - 4;
+    int step = (millis() / 150) % (innerWidth + 1);
+    display.fillRect(rectX + 2, rectY + 2, step, rectHeight - 4, WHITE);
+  }
+
   display.display();
   #endif
 }